diff --git a/apps/server/src/cliAuthFormat.test.ts b/apps/server/src/cliAuthFormat.test.ts
index 3822919a9276e8d09f689766ff2fe9db3ab9fce5..5828d6518a96fc3571bf112def3ab1b56f501366 100644
--- a/apps/server/src/cliAuthFormat.test.ts
+++ b/apps/server/src/cliAuthFormat.test.ts
@@ -23,6 +23,8 @@ it("formats issued pairing credentials with the secret and optional pair URL", (
 
   expect(output).toContain("secret-pairing-token");
   expect(output).toContain("https://example.com/pair#token=secret-pairing-token");
+  expect(output).toContain("Expires at: 2026-04-08T10:00:00.000Z");
+  expect(output).not.toContain("DateTime.Utc");
 });
 
 it("formats pairing listings without exposing the secret token", () => {
diff --git a/apps/server/src/cliAuthFormat.ts b/apps/server/src/cliAuthFormat.ts
index 2af32d71c8de4e131a18d6308fdbf0f639e7b39c..da87d1cc9280aa30b078a8a196b8067e4344c512 100644
--- a/apps/server/src/cliAuthFormat.ts
+++ b/apps/server/src/cliAuthFormat.ts
@@ -61,7 +61,7 @@ export function formatIssuedPairingCredential(
       `Issued client pairing token ${credential.id}.`,
       `Token: ${credential.credential}`,
       ...(pairUrl ? [`Pair URL: ${pairUrl}`] : []),
-      `Expires at: ${credential.expiresAt}`,
+      `Expires at: ${toIsoString(credential.expiresAt)}`,
     ].join(newline) + newline
   );
 }